A 600MHz CMOS OFDM LINC transmitter with a 7 bit digital phase modulator

Author

Kim, Kwan-Woo ; Byun, Sangjin ; Lim, Kyutae ; Lee, Chang-Ho ; Laskar, Joy

Author_Institution

Georgia Inst. of Technol., Atlanta, GA

fYear

2008

fDate

June 17 2008-April 17 2008

Firstpage

677

Lastpage

680

Abstract

This paper presents a new architecture for a LINC transmitter adopting a digital phase modulator (DPM). The DPM uses a 7 bit digital input to directly modulate the RF phase of each path, thus simplifying gain/phase mismatch compensation. Furthermore, this feature needs only one set of test signals for gain and phase mismatch detection. The implemented LINC transmitter IC consumes 140 mA from a 1.9V supply including an LC quadrature VCO, two DPMs, and two PA driver amplifiers, and it transmits a 6 MHz bandwidth 64-QAM OFDM signal in the UHF TV band with external switching PAs and a power combiner.

Keywords

CMOS integrated circuits; OFDM modulation; UHF integrated circuits; UHF power amplifiers; amplification; modulators; radio transmitters; CMOS OFDM LINC transmitter; PA driver amplifiers; QAM OFDM signal; RF phase; UHF TV band; bandwidth 6 MHz; digital phase modulator; frequency 600 MHz; gain-phase mismatch compensation; phase mismatch detection; power combiner; quadrature VCO; voltage 1.9 V; Digital modulation; Driver circuits; OFDM modulation; Phase detection; Phase modulation; Radio frequency; Testing; Transmitters; UHF integrated circuits; Voltage-controlled oscillators; LINC; OFDM; digital phase modulator (DPM); mismatch compensation; out-phase; phase interpolator (PI);

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium, 2008. RFIC 2008. IEEE

Conference_Location

Atlanta, GA

ISSN

1529-2517

Print_ISBN

978-1-4244-1808-4

Electronic_ISBN

1529-2517

Type

conf

DOI

10.1109/RFIC.2008.4561528

Filename

4561528